DØ Muon Level 3 Filtering

Link to latest information on the L3Muon filter will appear here

Requirements and available data

The Level 3 Processor farm is made of commercial processors running Linux. With the expected rate of at least 1000 Hz into Level 3, and the expected output rate of 50 Hz, the Level 3 should pass about 1 on 20 events. The requirements, and available data at L2 and L3 are listed in this summary page .

L3 Muon Filter

The Level 3 Muon filter, L3FMuon, uses information about muon candidates from the Level 3 Muon tool (see below) to make a trigger decision.

L3 Muon Tool

The Muon Level 3 tool, L3TMuon, provides the following physics results to be used in muon filtering. The "physics results" will be included in the Thumbnail and are documented in the proposal for l3 muon contents in Thumbnail .

L3TMuon gets Level 2 muon seeds and calls auxiliary tools to unpack and process data in the muon system, calorimeter, and central tracking in the neighborhood of each seed. (See draft flow chart.)

Tools and algorithms under development

See a user guide by Paul Balm.)

Muon unpacking, L3TMuoUnpack This is the tool that accesses muon data. It gets level 2 seeds, does a directed unpacking of the muon wire data in the neighorhood of all seeds and converts them to space points to be used in the tracking tool, L3TMuoLocal .
Fast reconstruction of the local muon track, L3TMuoLocal. This tool uses hit space points to reconstruct track segments in a single module, and then link segments before and behind the toroid to make a full track (the latter is skipped in the case of the lowest pt threshold).

Fast Calorimeter confirmation and isolation , l3fmuo_caltrack and l3fmuo_calmatch . For Run I documentation of D0 MTC (Muon Tracking in the Calorimeter) see MTC home page
Fast central track match L3TMuoCentralMatch that calls a fast central tracker, L3TTracker ("CFT" or "Global")
Scintillator tool using constrained track parameters to narrow down the scintillator time window.
Displaced vertex (Impact parameter tool).

Documentation

"The D0 Level-3 muon filter" -- d0note 3999
"Level-3 Muon Dynamic Unpacker" -- d0note 3992
"Central Track Matching of Muon Track at Level 3" -- d0note 3934

Talks

See minutes of L3 algorithms meetings
Paul Balm's talks and muon page

L3 Muon mailing list

We have our own mailling list called D0-L3MUON. The archive can be found here.
To join the list, send a mail to listserv@fnal.gov with "SUBSCRIBE D0-L3MUON [your first name] [your last name]" (without the quotation marks) in the body of the email.
To leave the list, send a mail to listserv@fnal.gov with "UNSUBSCRIBE D0-L3MUON" (without the quotation marks) in the body of the email.
Contact Stefan Soldner-Rembold in case of a problem.